Pneumatic stamping machine



Sept. 5, 1933. w, DOYLE E A 1,925,236

PNEUIATIC STAIPING IACHINB Filed Sept. 17, 1928 2 Sheets-Sheet 2 @uumujj *I W I.

IIWEITITJ'FE Frederick InLDogle John IllF' ger's Patented Sept. 5, 1933 PNEUMATIC STAMPING MACHINE Frederick W. Doyle, Chicago, and John 0. Rogers, Maywood, 111., assignors, by mesne assignments, to Associated Electric Laboratories, Inc., Chicago, IlL, a corporation of Delaware Application September 1'7, 1928 Serial No. 306,600

13 Claims.

This invention pertains to stamping machines in general, but more particularly to pneumatisally operated machines for stamping numbers on work parts.

s The object of this invention is the production of a pneumatically operated stamping machine having various improved operating characteristics and safety ieatures.

A particular feature of this invention is that the machine cannot be operated unlew work to be stamped has actually been placed in position in the machine. By making it impossible to operate the machine unless work is in position, the possibility of the stamping type being ruined 'by operating the machine and forcing the type down on to the Jaws of the machine with no work in the laws is thereby positively eliminated.

Another feature of this invention is that the operator must use both of his hands to initiate so the stamping operation. Thereby the possibility. oi the operator crushing one of his hands in the machine is entirely eliminated since both hands must be occupied to cause the stamping operation.

Machines of this kind have particular utility in the manufacture of relay coils upon which the piece part number, or the ohmic resistance, or both is to be stamped. The invention has therefor been illustrated in the accompanying 89 drawings in the form of a stamping machine for stamping numbers on the end piece of relay spools. The invention, however, readily lends itself to many modifications without departing from the spirit thereof, and many other uses will suggest themselves to those skilled in the art.

The contruction of the machine is illustrated in the accompanying drawings comprising Figs. 1 to 6 inclusive. Fig. 1 is a side view of the machine: Fig. 2 is a front view of the machine; Fig. 3 is a sectional plan view of part of the machine including the clamping jaws, along the line 3-4! of Fig. 2; Fig. 4 is a sectional view showing the type holding mechanism along the line, 4-4 of Fig. 2; Fig. 5 is a bottom view of the parts shown in Fig. 4; and Fig. 6 is an enlarged sectional view of the safety valve mechanism along the line 8-6 of Figs. 1 and 2.

The machine is built upon the c-shaped frame 11, such as is ordinarily used in stamping me.-

chines. A double ended cylinder 12 is pivotally mounted on the back of the base of the c-shaped frame on the wrist pin 9. Within the cylinder 12, a piston moves either forward or backward depending on in which end compressed air is conducted.

A plunger 13 slides up or down through the center of the head 8 of the C-shaped frame 11. The movement of the plunger 13 is controlled by the piston of the cylinder 12 through the linkage comprising members 18 and 19. When the piston is forced upwards, the plunger 13 is forced downwards, and vice versa.

The plunger 13 has an elliptically shaped head 22, the underside of which has a circular depression into which the clamping ring 48 screws to hold the type holder 49 in position.

The type holder 49 is a cylinder block having a flange 52 on its upper end by which it is held against the head 22 by the clamping ring 48. The hole 53 is provided to receive the core of the relay spool when the end piece of the spool is being stamped. Two rectangular slots are provided, one on each side of the hole 53, for receiving the stamping type. The type are assembled in these slots and are held in position by means of pins 54. These pins pass through the transverse pin holes 55, which meet the rectangular slots, and into small slots on the side of the type. The proper location of the type holder with respect to the plunger head 22 is determined by the pin 56 in the depression in the head 22, which fits into the small pin hole 52 in the upper face of the type holder 49.

On the base of the C-shaped frame, the anvil 16 is bolted by means of the bolts 20. On top of 86 the anvil two liner pins 21 are mounted. These liner pins slide through holes 57 in the head 22 of the plunger for the purpose of more accurately guiding the plunger in its downward movement. The anvil 16 has a deep groove 58 beveled 90 on its left hand side, extending down the full length in its front face to receive the lower end of the spool when the latter is clamped in position.

On top of the anvil 16 two jaws 14.and 15 are mounted. The jaw 14 may be rotated about the screw 23 by means of the handle 24 fastened to this jaw. The upper face of the jaw 14 is gouged out in order to receive the rectangular block 25. The block 25 has a semi-cylindrical recess 26 of a size just sumcient to accommodate the core of a particular relay spool. The top of the block 25 has two shallow radial grooves 26 for the purpose of accommodating the terminals 5 of the relay spool when the spool is placed in position, so that the end piece of the spool will rest flat on the top of the block 25. The lower face of the jaw 14 is also gauged out to form the recess 61 to accommodate the lower end piece of a spool whose length is less than the thickness of the jaw when such is to be stamped.

The remaining portion of the jaw 14 between the recess accommodating the block 25 and the lower recess 61 also has a semi-cylindrical recess, the size of which is sufiicient to accommodate the largest core that the machine is called upon to take. As many different blocks, similar to the block 25, will be furnished with the machine as there are different types of relay spools which the machine will be called upon to stamp, each block being adapted for a particular type of relay spool in the number and position of the radial grooves to accommodate the terminals and in the diameter of the semi-cylindrical recess.

The jaw 15 is securely fastened to the anvil 16 by means of the screws 27-. The upper working corner of the jaw 15 is notched to accommodate the plate 28, the latter being secured to the jaw by means of screws 29. The plate 28 is made removable so that it may be replaced for the reason that this plate together with the block 25, form the bearing surfaces for the end pieces of the spools and therefore receive the wear.

The jaw 15 also houses the safety valve mechanism as is shown in section in Fig. 6. The valve mechanism comprises the intake port 30 into which the intake pipe 38 threads, the outlet port '31 into which the outlet pipe 37 threads, and

the cup-shaped, leather or rubber packed valve 36 which is controlled by the valve stem 32 and is held against the valve seat 33 by the spring 34, the latter being held in position by means of the retaining screw 35. The valve stem 32 extends through a longitudinal hole to the outside of the jaw. A small flange 39 prevents the valve stem from coming out. When the valve stem 32 is pressed flush with the edge of the jaw, the valve opens to allow the passage of air from the intake port 30 through to the outlet port 31.

The outlet pipe 37 is connected by means of pipe fittings with the two-way valve 17 mounted to the base of the c-shaped frame 11 by means of two bolts 41. The valve is controlled by means of the operating lever 7 and is provided with hose connections 42 and 43 from'the valve to the two ends of the cylinder 12. In the drawings, the

' lever '7 is shown in its normal position against the exhaust port 47. when the lever l is rotated in a counter-clockwise position up against the pin 46, the valve is open to conduct air through the hose 43 into the bottom end of the cylinder 12, and the hose 42 is connected with the exhaust port 47. Of course the valve 17 is ineffective to cause any motion of the piston in the cylinder until the safety valvein the jaw 15 is opened, as will be described presently. I

To operate the machine, the operator after inserting the proper type in the type holder 49,

- places the relay spool to be stamped in the posiin the position shown by dotted lines in Fig. 3. The core of the spool strikes the valve stem 32 and presses it inward flush with the face of the jaw 15, thereby opening the safety valve and allowing air to pass from the intake port 30 through to the outlet port ,31. The handle 7 of the valve 17 then rotated in the counter-clockwise direction until it strikes the pin 46. This operation opens the valve l'l to allow air to be conducted into the lower end of the cylinder 12, and since the safety valve is also open the piston in the cylinder is forced upward and the plunger 13 is forced downward causing the type 51 to make an impression on the top end piece of the spool held between the jaws 14 and 15.

The lever TI is held in its operated-position only momentarily and when it is released, it is quickly pulled back to its normal position by the spring 44. With the handle 24 held in its operated position holding the relay spool betwen the two jaws l4 and 15 and lever 7 in its normal position, the air in the bottom end of the cylinder is exhausted and air is conducted into the top end of the cylinder, thereby pushing the piston and the plunger 13 back to its normal position. The operator then opens the jaws l4 and 15 with handle. 24 and removes the spool.

From the above descriptions ofthe operation of the machine, it is apparent that the machine cannot be operated, if no relay spool is placed in position even though the jaws 14 and 15 are closed and the valve lever 7 is operated, since in this case the safety valve located in the jaw 15 will not be operated. Furthermore, the operator must use both hands-to initiate the stamping operation. He cannot operate it with one hand and accidentally crush his other hand. It should be mentioned also that to further safeguard the operator, the tension of the spring 34 is made strong enough to make it impossible for the operator to push in the valve stem 32 with his finger, so that the machine is safety proof even to the extent that it cannot be operated should the operator attempt to push the valvestem with his finger and operate the lever '7 at the same time.

A particular feature of the machine is that it will accommodate spools whose end pieces vary greatly in thickness, without having to make any adjustment to the machine whatsoever; For example, a certain relay that is used in the construc- 125 tion of telephone apparatus requires the presence of a heavy copper slug a half an inch or more in thickness on the end. If it is desirable to'place the identification stamping directly on this copper end piece, it may be done so on this machine 130 in the regular manner as described above without any further adjustment of the machine. Of course, the machine, in operating when a spool of this kind is placed in position between the jaws 14 and 15, does not travel the same distance, but

the same pressure is applied nevertheless.

What is claimed is:

1. In a pneumatic stamping machine, the combination of a manually operable valve and a second valve in serial relation with the first valve controlled by the work to be stamped when the latter is clamped in position in the machine.

2. In apneumatic stamping machine, a stationary jaw, a movable jaw shaped to receive the work to be stamped, a valve mechanism in the stationary jaw controlled by a valve stem projecting out of the jaw, and means for pressing the two jaws together and the work against the valve stem to firmly hold the work and to operate the valve mechanism.

3. In a pneumatic stamping machine, a plunger, a movable holder for holding the work to be stamped, means for moving it into operative relation with said plunger, and a safety valve operated by the movement of the holder into operative relation with said plunger, providing work to be stamped is in the holder.

4. In a pneumatic stamping machine, the combination of two serially related valves, means controlled by one hand of the operator for controlling one of the valves, and means controlled by the other hand of the operator for controlling the other valve, said last means including means for holding the work to be stamped.

5. In a stamping machine for stamping num-' tionary jaw, and mechanism in the stationary jaw for controlling the operation of the machine, said mechanism including a valve stem projecting out from the jaw opposite the recess in the movable Jaw.

6. In a pneumaticstamping machine, a pair of jaws for holding the work to be stamped, and an air valve for controlling the operation of said machine, said air valve adapted to be operated by the work to be stamped when the work is clamped between said pair of jaws.

'7. In a stamping machine for stamping numbers on work parts, a pair of jaws one of which is movable with respect to the other, one of said jaws having a recess for receiving the work to be stamped, and mechanism associated with the other jaw for controlling the operation of the machine, said mechanism including a control button positioned opposite the recess in the one 8. In a pneumatic stamping machine, means for holding the material in the machine while the stamping operation is taking place, a plunger, a valve for controlling the operation of said plunger, and means for rendering said valve in efiective unless said material is properly positioned in said machine.

9. In a. machine, a base upon which a piece of material is positioned, a movable member for performing a useful operation on said material while the same is positioned on said base, a manually operated device for supplying power to said movable member, and means for rendering the operation of said device ineffective unless the material is in proper position on said base.

10. In a machine, a base upon which apiece of material is positioned, a movable member for performing a useful operation on said material while the same is positioned on said base, a'manually operated device for initiating the supply of power to said movable member, and an auxiliary device for completing the supply of power to said member only when the material is in proper position on said base.

11. In a machine, two jaws for receiving a piece of work and holding the work while a useful operation is performed thereon, a valve mechanism in one of said jaws, and a. valve stem for operating said mechanism, said stem projecting out of the jaw so that it is operated by a piece of work properly positioned in the machine.

12. In a machine, means for holding a piece of work while a useful operation is performed thereon, a manually operated valve for controlling the operation of said machine, a second valve, and means operated by a piece of work properly positioned in said machine for controlling said second valve to render said first valve eifective.

13. In a machine, a base upon which a piece of work is positioned, a movable member for performing a useful operation on the work, a manually operated device for controlling the operation of said mo'vable member, a movable pin directly operated by a piece of work properly posi" tioned on said base, and means controlled by said movable pin for rendering said device effective.

FREDERICK W. DOYLE. JOHN C. ROGERS. 

